Grill brush



FIG. 1 is a perspective view of a grill brush showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side view, the opposite side being a mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a grill brush, as shown and described. 